Bit-stock



(No Model.)

K. L. MARLIN.

' BIT STOCK. No. 596,604. Patented Jan. 4,1898.

UNITED STATES PATENT OFFICE.

KEMUEL LEMUEL MARLIN, OF THETA, TENNESSEE.

BIT-STOCK.

SPECIFICATION forming part of Letters Patent No. 596,604, dated January4, 1898. Application filed June 30, 1897. Serial No. 642,953. (Nomodel.)

To all whom it may concern: Be it known that I, KEMUEL LEMUEL MAR- LIN,a citizen of the United States, residing at Theta, in the county ofMaury and State of Tennessee, have invented a new and usefulBit-Stock,of which the following is a specification.

The invention relates to improvements in bit-stocks.

The object of the present invention is to improve the construction ofbit-stocks and to provide a simple, strong, and eflicient one, whichwill enable holes to be rapidly bored adjacent to walls or otherobstructions without employing ratchet mechanism.

A further object of the invention is to enable the parts to be readilyadjusted for ac-v commodating gear-Wheels of diflterent diameters, sothat gearing suitable to the character of bit used may be employed.

Another object of the invention is to improve the construction of theframe of the bitstock, to provide convenient breast-rests, and to enablean operator to exert the desired pressure without liability of injuringthe crank.

The invention consists in the construction and novel combination andarrangement of responding parts in the several figures of the drawings.

1 designates the frame of a bit-stock, comprising a main side bar 2, atransversely-disposed stationary grip or bar 3, and a longitudinalbracing-bar 4, disposed substantially parallel with the bar 2 andextending from one end of the grip 3. The longitudinal bar 3 has itsouter portion 5 inwardly offset by a central bend to bring a rotarybit-socket 6 in line with the pressure exerted on the device and also tolocate the said bit-socket close to the edge of the longitudinal bar 2in order that holes may be bored close towalls or similar obstructions.The longitudinal bar 2, which is provided with an outwardly-extendingarm 7, has a bearing at the outer end thereof to receive a shank orjournal 8 of the rotary bit-socket. A pinion 9, which is arranged on theinner edge of the arm 7, is detachably secured to the end of the shankor journal and meshes with a gear-wheel 10, which is detachably securedto one side of a double crank 11.

The double crank 11, which is provided with a rotary grip 12, has oneside journaled in an adjustable and reversible bearing-block 13, and theother side of the crank is adapted to engage any one of aseries ofbearing openings or sockets 14 of the bracing-bar 4. The reversible andadjustable bearing-block, which has its ends rounded, is arranged in alongitudinal slot 15 of the bar 2, and it is provided with twobearing-perforations 16, locatedat the center and one end of it. Byreversing the bearing-block the end opening or perforation may bebrought adjacent to either end of the slot 15 for accommodating verysmall and very large gear-wheels. The longitudinal adjustment of theblock will accommodate the medium class of gears. The bar 2 is providedwith a threaded perforation receiving a clamping-screw 17, which engagesthe bearing-block and secures the same at any desired adjustment. .Whenthe bearing-block is adjusted, the other side of the crank iscorrespondingly adj usted. The pinion 9 is secured to the bit-socket bymeans of a screw 18 or other suitable fastening device, and the gearanut 19.

The gear-wheels are readily detached to permit the desired adjustment ofthe parts, and gears of different diameters may be employd, so that agear suitable to the character of the bit used may be employed. Thelarge bits requiregreat leverage, and in the use of such gear ispreferably employed which will produce one revolution of the bit-socketto each revolution of the crank; but in the use of smaller bits thebit-socket may be rotated to any desired extent by varying the diametersof the gears.

. 79 wheel 10 is preferably secured to the crank by The longitudinal bar2 is extended slightly beyond the rigid grip 3 and has a stationarybreast-rest 20 secured to it and arranged directly opposite the bit-socket in order to bring the pressure directly in line with the bit.The stationary breast-rest is located at one side of the frame, and amovable rest 22 is pivotally mounted at the opposite side of the frameand is attached to one end of the grip 3, adjacent to the inner end ofthe bar 4. The grip 3 is reduced adjacent to the bar 4, and the pivotedrest 22, which is adapted to be swung out of the way when not in use,consists of a curved bearin g portion and a pair of converging armsembracing the grip 3 at the reduced portion thereof. The bar 4: isprovided with an extension which is secured to the back of the grip 3;but the frame may be connected in any other suitable manner.

This invention has the following advantages: The bit-stock is simple,strong, and durable and easily manipulated, and it is capable of boringholes adjacent to walls or similar obstructions. It will enable anyamount of pressure to be employed without liability of bending the crankportion, and in drilling or boring close to obstructions it permits afree forward rotation of the bit and does not require the use of ratchetmechanism, which is operated by backward-and-forward movement and whichrequires a much greater time to bore a hole. The gearing may be readilychanged to suit the character of bit employed, so that the greatestleverage may be employed when large bits are used and so that small bitsmay be rapidly rotated.

ingin line with the pressure exerted on the I breast-rest, a rigid gripextending from the longitudinal bar at a point adjacent to thebreast-rest,and alongitudinal supporting-bar extending from the grip andarranged substantially parallel with the longitudinal bar, a rotarybit-socket journaled in the said hearing, and a crank journaled on thesides of the frame and connected by gearing with the bitsocket,substantially as described.

2. In abit-stock, the combination of a frame comprising a longitudinalbar provided with abearing at one end, a breast-rest secured to theother end of the bar, a rigid grip extending from the longitudinal barat a point adjacent to the breast-rest, and the longitudinalsupporting-bar extending from the grip and arranged substantiallyparallel with the said longitudinal bar, a pivoted breast-rest mountedon the grip and arranged in line with the stationary breast-rest andadapted to be swung out of the way when not in use, a rotary bit-socketj ournaled in the said bearing, a crank journaled on the sides of theframe, and gearing connecting the crank and the bitsocket, substantiallyas described.

- 3. In a bit-stock,the combination of a frame provided at one side witha series of bearingsockets and having a longitudinal slot at theopposite side, an adjustable and reversible bearing-block arranged insaid slot and provided with hearing -perf0rations, a double crank journaled in one of the bearing-sockets and in one of the perforations ofthe bearingblock, a rotary bit-socket, removable gearing connecting thebit-socket with the adjacent end of the crank, and means for securingthe bearing-block at the desired adjustment, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of twowitn esses.

KEMUEL LEMUEL MARLIN.

Witnesses:

J. M. HARBISON, J. K. RAGSDALE.

